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Norwegian normative data for regression-based D-KEFS color-word interference test derived measures and comparison to
Ingrid Myrvoll Lorentzen1, Jacob Espenes1, Ingvild Vøllo Eliassen2,3
1Department of Psychology, Faculty of Health Sciences, UiT-The Arctic University of Norway, Tromsø, Norway.
Applied Neuropsychology. Adult
|February 17, 2025
Summary
New regression-based measures for the Delis Kaplan Executive Functions system (D-KEFS) Color-Word Interference Test (CWIT) offer improved reliability and demographic adjustment in Norwegian adults. These regression measures demonstrate better stability over time compared to conventional contrast measures.
Area of Science:
- Neuropsychology
- Cognitive Psychology
- Psychometrics
Background:
- The Delis Kaplan Executive Functions system (D-KEFS) Color-Word Interference Test (CWIT) is a key neuropsychological tool for assessing executive functions.
- Conventional contrast measures derived from the CWIT have faced criticism due to a lack of Norwegian norms and low reliability.
- Existing contrast measures may be influenced by demographic factors and basic cognitive abilities.
Purpose of the Study:
- To develop and validate regression-based derived measures for the D-KEFS CWIT using a large Norwegian sample.
- To compare the psychometric properties, including reliability and demographic adjustment, of these new regression measures against conventional contrast measures.
- To provide normative data for the regression-based measures in a healthy Norwegian population aged 20-85 years.
Main Methods:
- A large sample of 1011 healthy Norwegians aged 20-85 years was recruited from three distinct cohorts (DDI, Oslo MCI, LCBC).
- Multiple regression analyses were employed to model the relationship between lower-level (reading/naming) and higher-level (inhibition/switching) CWIT conditions.
- Conventional contrasts and regression-based measures were statistically evaluated for demographic influences and stability over time using intraclass correlation coefficients (ICCs).
Main Results:
- Conventional contrast measures exhibited residual effects from demographics and basic cognitive functions.
- Regression-based derived measures demonstrated superior adjustment for demographic variables and lower-level task demands.
- Stability analyses revealed poor to moderate ICCs (0.39-0.56) for conventional contrasts, whereas regression measures showed somewhat higher ICCs (0.50-0.65).
Conclusions:
- Regression-based derived measures for the D-KEFS CWIT offer significant advantages over conventional contrast measures in terms of demographic adjustment and temporal stability.
- These new measures provide a more reliable assessment of executive functions, specifically inhibition and switching, within the Norwegian population.
- Further research incorporating clinical samples is recommended to fully ascertain the clinical utility of these regression-based measures.
